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early 70s 504
Posted: Thu Sep 09, 2010 8:50 pm
by Roe
I had a 1972 504 on my bench today. sounded great with original caps (but without original tubes). I guess the caps will have to be changed sometime but I dont feel like changing more than necessary
Re: early 70s 504
Posted: Fri Sep 10, 2010 11:59 am
by mhuss
I just check for excessive "bulge factor" on the the cap seals. I have a '70 I still haven't recapped, but I don't gig with it, so I'm not as worried about reliability.
--mark
Re: early 70s 504
Posted: Sat Sep 11, 2010 2:47 pm
by Roe
no bulges at all. and she sound powerful and isn't noisy. owner hadn't though about caps at all. he was worried about tubes but these were good
Re: early 70s 504
Posted: Sat Sep 11, 2010 5:51 pm
by OldSchoolDave
Roe wrote:no bulges at all. and she sound powerful and isn't noisy.
In that case, I wouldn't change anything, either.
So - what do you suppose accelerates cap failure? Use? Lack of use? Wide temperature swings?
Dave
Re: early 70s 504
Posted: Sun Sep 12, 2010 10:14 am
by Roe
the way to kill caps is to leave them unused for years and then hit them with massive voltage without any prior forming.